CN113444618A - Heat preservation and methane heating furnace fuel supply system for steel waste heat methane tank and treatment method - Google Patents

Heat preservation and methane heating furnace fuel supply system for steel waste heat methane tank and treatment method Download PDF

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Publication number
CN113444618A
CN113444618A CN202110842261.8A CN202110842261A CN113444618A CN 113444618 A CN113444618 A CN 113444618A CN 202110842261 A CN202110842261 A CN 202110842261A CN 113444618 A CN113444618 A CN 113444618A
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methane
biogas
heating furnace
heat
tank
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姬爱民
张磊
吴旭达
徐亚男
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North China University of Science and Technology
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North China University of Science and Technology
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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M21/00—Bioreactors or fermenters specially adapted for specific uses
    • C12M21/04—Bioreactors or fermenters specially adapted for specific uses for producing gas, e.g. biogas
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M23/00—Constructional details, e.g. recesses, hinges
    • C12M23/36—Means for collection or storage of gas; Gas holders
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M29/00—Means for introduction, extraction or recirculation of materials, e.g. pumps
    • C12M29/18—External loop; Means for reintroduction of fermented biomass or liquid percolate
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M41/00—Means for regulation, monitoring, measurement or control, e.g. flow regulation
    • C12M41/12—Means for regulation, monitoring, measurement or control, e.g. flow regulation of temperature
    • C12M41/18—Heat exchange systems, e.g. heat jackets or outer envelopes
    • C12M41/22—Heat exchange systems, e.g. heat jackets or outer envelopes in contact with the bioreactor walls
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M43/00—Combinations of bioreactors or fermenters with other apparatus
    • C12M43/04—Bioreactors or fermenters combined with combustion devices or plants, e.g. for carbon dioxide removal
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M47/00—Means for after-treatment of the produced biomass or of the fermentation or metabolic products, e.g. storage of biomass
    • C12M47/18—Gas cleaning, e.g. scrubbers; Separation of different gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K5/00—Feeding or distributing other fuel to combustion apparatus
    • F23K5/002—Gaseous fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/36—Arrangements of heating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/36—Arrangements of heating devices
    • F27B2009/3653—Preheated fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein
    • F27D2009/0002—Cooling of furnaces
    • F27D2009/001—Cooling of furnaces the cooling medium being a fluid other than a gas
    • F27D2009/0013—Cooling of furnaces the cooling medium being a fluid other than a gas the fluid being water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F27D2099/0053—Burner fed with preheated gases
    • F27D2099/0055—Fuel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Abstract

The invention provides a heat preservation and heating furnace fuel supply system and a processing method for a steel waste heat methane tank, wherein the fuel system comprises a raw material storage premixing tank, a methane fermentation device, a methane purification device, a gas storage tank, a heat exchanger and a heating furnace; the raw material storage premixing pool, the biogas fermentation device, the biogas purification device, the gas storage tank and the heating furnace are sequentially connected, a cooling assembly is arranged in the heating furnace, a heat exchange coil is arranged inside the raw material storage premixing pool, the cooling assembly is connected with a heat exchanger pipeline, the heat exchanger is connected with the heat exchange coil, and the heat exchange coil is connected with a cooling assembly of the heating furnace. On the basis of meeting the production requirements of steel enterprises, the invention not only reduces the consumption of traditional energy sources and the waste heat waste problem of the steel enterprises, but also solves the problems of temperature rise and heat preservation of the methane tank, improves the methane yield, and provides technical conditions for energy conservation of methane engineering and consumption reduction of the steel enterprises.

Description

Heat preservation and methane heating furnace fuel supply system for steel waste heat methane tank and treatment method
Technical Field
The invention belongs to the technical field of biogas treatment, and particularly relates to a heat preservation and biogas heating furnace fuel supply system for a steel waste heat biogas digester and a treatment method.
Background
The biogas engineering is a technology for converting degradable agricultural and rural organic wastes into biogas and biological fertilizer by using the action of anaerobic microorganisms, can realize waste recycling, can provide clean and convenient fuel gas and promote the virtuous cycle of agricultural ecology, and is an important technical measure for realizing the sustainable development of Chinese agriculture.
Although China is one of the earliest countries for researching and utilizing methane in the world, at present, methane engineering in China mainly treats organic waste and methane by itself, the scale is smaller, and large and medium-sized methane engineering constructed by the method aims at treating excrement and sewage of livestock and poultry farms and part of domestic wastes. Common processes for large-scale biogas engineering in China are a complete mixed fermentation process (CSTR), an Upflow Anaerobic Sludge Blanket (UASB) and an Upflow Solid Reactor (USR). The processes suitable for high-concentration fermentation include a plug flow type digester (HCPF), a vertical plug flow type fermentation process (VPF), a sequencing batch solid state fermentation process and the like. China does a lot of work in the aspect of fermentation process development, the technology is relatively mature, but how to ensure the stable operation of fermentation equipment is the key for solving the technical development dilemma of the biogas engineering in China.
The temperature is one of the key factors influencing the gas production rate of the biogas fermentation, and can be divided into a normal-temperature fermentation zone of 1O-26 ℃, a medium-temperature fermentation zone of 28-38 ℃ and a high-temperature fermentation zone of 46-60 ℃ according to the biogas fermentation temperature. In a proper fermentation temperature range, along with the temperature rise, the decomposition speed of the raw materials is accelerated, the utilization rate is increased, the organic load bearing rate of a fermentation tank is increased, and the hydraulic retention time is shortened. The gas selling benefit is better than the electricity selling benefit due to national policy, the normal temperature or medium temperature fermentation process is mostly adopted in domestic large and medium-sized biogas projects, the winter efficiency of a fermentation system is lower, the production cost is increased by adopting an external heating device, and the seeking of a low-cost heat preservation mode is an important problem for improving the fermentation stability of the biogas.
Because the biogas project is relatively small in scale and far away from towns, a large amount of biogas is used as production and living fuel of the farm. The centralized large and medium-sized biogas project is influenced by the problems of the number of supplied households, the living centralization degree, the geological conditions and the like, the construction and maintenance cost of a gas supply pipe network is high, the charging management difficulty is high, and the economic benefit is poor. If the biogas is supplied by compression and canning, the equipment investment and the biogas cost are increased. Stable biogas distribution and low-cost delivery are effective ways to increase the economic benefits of biogas projects.
Solves the problems of high-efficiency and low-cost methane conveying and low-cost temperature rise and heat preservation of the methane tank, and is an important guarantee for the stable operation of the methane project.
Disclosure of Invention
Aiming at the prior art, the invention provides a heat preservation and biogas heating furnace fuel supply system of a steel waste heat biogas digester and a treatment method thereof, aiming at solving the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the heat preservation and methane heating furnace fuel supply system of the steel waste heat methane tank comprises a raw material storage premixing tank, a methane fermentation device, a methane purification device, a gas storage tank, a heat exchanger and a heating furnace; the raw material storage premixing pool, the biogas fermentation device, the biogas purification device, the gas storage tank and the heating furnace are sequentially connected, a cooling assembly is arranged in the heating furnace, a heat exchange coil is arranged inside the raw material storage premixing pool, the cooling assembly is connected with a heat exchanger pipeline, the heat exchanger is connected with the heat exchange coil, and the heat exchange coil is connected with the cooling assembly of the heating furnace so as to realize water recycling.
Furthermore, the cooling assembly comprises a fixed beam and a walking beam which are arranged in the heating furnace, cooling water channels are arranged in the fixed beam and the walking beam and are respectively communicated with the heat exchanger and the heat exchange coil to realize heat exchange recycling of cooling water and guarantee the service life of the fixed beam and the walking beam in the heating furnace.
Further, the biogas purification device is a desulfurization dehydration purification device.
Further, the outlet of the cooling water assembly is connected with a heat exchanger.
Further, the fuel system also comprises a tee-joint fuel gas mixing pipeline, one inlet of the fuel gas mixing pipeline is communicated with natural gas (LNG), the other inlet of the fuel gas mixing pipeline is communicated with biogas of a gas storage tank, and an outlet of the fuel gas mixing pipeline is communicated with the heating furnace.
Furthermore, a pressurizing device is arranged on the gas mixing pipeline, so that the natural gas (LNG) and the methane are mixed more uniformly.
Furthermore, an inlet and an outlet of the heat exchange coil are connected with the heat exchanger, and circulating water in the coil exchanges heat with steam to adjust the temperature, so that the biogas fermentation device can ferment more stably.
Furthermore, a discharge port of the biogas fermentation device is connected with a solid-liquid separation device, and a liquid outlet of the solid-liquid separation device is communicated with the raw material storage premixing tank, so that a part of separated biogas slurry can dilute the raw material in the premixing tank.
The treatment method of the heat preservation of the steel waste heat methane tank and the fuel supply system of the methane heating furnace comprises the following steps:
(1) purifying the biogas generated by the biogas fermentation device by a biogas purification device, and then feeding the biogas into a gas storage tank;
(2) the biogas in the gas storage tank is directly conveyed to a preheating section heat source of a heating furnace of a steel enterprise through a pipeline, and can be independently used as fuel or mixed with the currently used Liquefied Natural Gas (LNG) to be used as the preheating section fuel;
(3) cooling the walking beam and the fixed beam in the heating furnace by using cooling water, and heating the cooling water to obtain water vapor with the temperature of 120-150 ℃;
(4) the steam generated by cooling water in the heating furnace is introduced into a biogas plant area through a pipeline, and after the steam exchanges heat with hot water to reach a proper temperature, the biogas fermentation device and the raw material storage premixing tank are heated and insulated through the coil pipe, so that the microbial activity, the organic matter fermentation rate and the gas production stability in the biogas tank are improved.
Further, the processing method further comprises:
(5) separating the waste fermented by the biogas fermentation device into biogas slurry and biogas residues through a solid-liquid separation device, conveying one part of the biogas slurry serving as a dilution liquid to a raw material storage premixing pool for diluting the raw material, and using the other part of the biogas slurry as a liquid fertilizer; wherein the biogas residues are used as organic fertilizers.
The invention has the following beneficial effects:
on the basis of meeting the production requirements of the steel enterprises, the invention not only reduces the consumption of traditional energy sources and the waste heat waste problem of the steel enterprises, but also solves the problems of temperature rise and heat preservation of the methane tank, improves the methane yield and provides technical conditions for the methane engineering and the industrial virtuous circle of the steel enterprises.
Drawings
FIG. 1 is a structural diagram of the working state of the heat preservation of the steel waste heat methane tank and the fuel supply system of the methane heating furnace provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
At present, biogas produced by biogas projects is used for self-use or resident gas supply, (1) the self-use amount is smaller than the gas production amount under the general condition, and a pipe network and pressurizing equipment need to be built for outward gas supply because the project points are far away, so that the cost is higher and the requirement on safety is higher. (2) At present, a technology for supplying biogas by adopting a compression and canning mode, namely compressing the biogas to about 4MPa and canning and conveying the biogas is also available, so that the biogas conveying capacity is improved, the investment in pipe network construction is reduced, the equipment investment is large, the compression cost is also available, and the profit margin in the biogas supply process is reduced. (3) The technology of purifying the biogas and preparing the biogas into the natural gas for the vehicle is used for improving the additional value of the biogas, but the equipment investment is large, the operation cost is high, the requirement of operators is high, the price of the prepared natural gas for the vehicle is impacted by the fuel price of the petrochemical industry, and the natural gas for the vehicle can be profitable only by subsidy of national policies.
At present, heat preservation of domestic biogas engineering projects mainly depends on heat supply of a steam boiler, solar heat supply or biogas cogeneration, the energy for heat supply of the steam boiler is mainly self-produced biogas, and due to climate reasons, the biogas consumption in winter is large, and the biogas sales income is reduced; although the solar heat supply does not need a heat source, the investment of the solar heat supply device is large, and the investment recovery period is long; in European countries, a cogeneration system is mostly adopted for increasing and preserving the temperature of the methane tank, but because the policy of China encourages the guidance problem, the gas selling benefit of the methane engineering is greater than the electricity selling benefit, so that the domestic methane engineering adopts the method to increase and preserve the temperature, and the projects are few.
As shown in fig. 1, a heat preservation and biogas heating furnace fuel supply system for a steel waste heat biogas digester comprises a raw material storage premixing pool, a biogas fermentation device, a biogas purification device, a gas storage tank, a heat exchanger and a heating furnace; the raw material storage premixing pool, the biogas fermentation device, the biogas purification device, the gas storage tank and the heating furnace are sequentially connected, a cooling assembly is arranged in the heating furnace, a heat exchange coil is arranged inside the raw material storage premixing pool, the cooling assembly is connected with a heat exchanger pipeline, the heat exchanger is connected with the heat exchange coil, and the heat exchange coil is connected with the cooling assembly of the heating furnace so as to realize water recycling.
In this embodiment, the heating furnace may be a step heating furnace, or may be another type of heating furnace, which does not limit the scope of the present invention, and a person skilled in the art may select the heating furnace according to actual situations.
In this embodiment, cooling unit is equipped with the cooling water course including setting up the fixed beam at the heating furnace in the fixed beam, the cooling water course communicates with heat exchanger and heat exchange coil respectively to realize cooling water heat transfer cyclic utilization, also ensured the life of the fixed beam in the heating furnace.
In this embodiment, the biogas purification device is a desulfurization dehydration purification device; and the outlet of the cooling water assembly is connected with the heat exchanger.
In this embodiment, the fuel system further includes a three-way gas mixing pipeline, one inlet of the gas mixing pipeline is communicated with natural gas (LNG), the other inlet of the gas mixing pipeline is communicated with biogas in the gas storage tank, and an outlet of the gas mixing pipeline is communicated with the heating furnace; and a pressurizing device is arranged on the gas mixing pipeline so that the natural gas (LNG) and the biogas are mixed more uniformly.
In this embodiment, the inlet and outlet of the heat exchange coil are connected to the heat exchanger, and the circulating water in the coil exchanges heat with the steam to adjust the temperature, so that the biogas fermentation device can ferment more stably.
In this embodiment, a discharge port of the biogas fermentation device is connected with a solid-liquid separation device, and a liquid outlet of the solid-liquid separation device is communicated with the raw material storage premixing tank, so that a part of separated biogas slurry dilutes the raw material in the premixing tank.
Example 2
The treatment method for the heat preservation of the steel waste heat methane tank and the fuel supply system of the methane heating furnace according to the embodiment 1 comprises the following steps:
(1) purifying the biogas generated by the biogas fermentation device by a biogas purification device, and then feeding the biogas into a gas storage tank;
(2) the biogas in the gas storage tank is directly conveyed to a preheating section heat source of a heating furnace of a steel enterprise through a pipeline, and can be independently used as fuel or mixed with the currently used Liquefied Natural Gas (LNG) to be used as the preheating section fuel;
(3) cooling the walking beam and the fixed beam in the heating furnace by using cooling water, and heating the cooling water to obtain water vapor with the temperature of 120-150 ℃;
(4) introducing steam generated by cooling water in a heating furnace into a biogas plant area through a pipeline, and after heat exchange with hot water to a proper temperature, heating and insulating a biogas fermentation device and a raw material storage premixing tank through a coil pipe so as to improve microbial activity, organic matter fermentation rate and biogas production stability in the biogas tank;
(5) separating the waste fermented by the biogas fermentation device into biogas slurry and biogas residues through a solid-liquid separation device, conveying one part of the biogas slurry serving as a dilution liquid to a raw material storage premixing pool for diluting the raw material, and using the other part of the biogas slurry as a liquid fertilizer; wherein the biogas residues are used as organic fertilizers.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The biogas generated by the biogas digester is purified by a desulfurization and dehydration device, enters a gas storage tank, is directly conveyed to a preheating section heat source of a heating furnace of an iron and steel enterprise through a close-range pipeline, can be independently used as a preheating section fuel, and can also be mixed with the currently used Liquefied Natural Gas (LNG) to be used as a preheating section fuel (because the heating furnace has huge fuel demand (120 tons of LNG per hour, the quantity is related to the scale of the heating furnace), the biogas yield cannot meet all gas supply requirements), in order to ensure the safe and normal operation of each part of the heating furnace, a walking beam and a fixed beam in the heating furnace need to be cooled by using cooling water, the cooling water is heated to become water vapor with the temperature of 120-, after heat exchange with cold water is carried out to a proper temperature, the temperature of the methane tank, the premixing tank and the gas transmission pipeline is increased and maintained through the coil pipe, so that the microbial activity, the organic matter fermentation rate and the gas production stability in the methane tank are improved. Because the iron and steel enterprises basically operate all weather, the rest heat generation quantity meets the requirement of the methane tank for operating all year round, and can be mutually butted in time to meet the production requirement.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims (10)

1. The heat preservation of steel waste heat methane-generating pit and biogas heating furnace supply fuel system, its characterized in that: comprises a raw material storage premixing tank, a methane fermentation device, a methane purification device, a gas storage tank, a heat exchanger and a heating furnace; the raw material storage premixing pool, the biogas fermentation device, the biogas purification device, the gas storage tank and the heating furnace are sequentially connected, a cooling assembly is arranged in the heating furnace, a heat exchange coil is arranged inside the raw material storage premixing pool, the cooling assembly is connected with a heat exchanger pipeline, the heat exchanger is connected with the heat exchange coil, and a steam condensate pipe after heat exchange is connected with the cooling assembly of the heating furnace so as to realize water recycling.
2. The heat preservation of the steel waste heat methane tank and the fuel supply system of the methane heating furnace according to claim 1, characterized in that: the cooling assembly is arranged in a fixed beam and a walking beam of the heating furnace, cooling water channels are arranged in the fixed beam and the walking beam and are respectively communicated with the heat exchanger and the heat exchange coil to realize heat exchange and cyclic utilization of cooling water.
3. The heat preservation of the steel waste heat methane tank and the fuel supply system of the methane heating furnace according to claim 1, characterized in that: the methane purification device is a desulfurization dehydration purification device.
4. The heat preservation of the steel waste heat methane tank and the fuel supply system of the methane heating furnace according to claim 1, characterized in that: and the outlet of the cooling water assembly is connected with the heat exchanger.
5. The heat preservation of the steel waste heat methane tank and the fuel supply system of the methane heating furnace according to claim 1, characterized in that: the fuel system also comprises a tee-joint fuel gas mixing pipeline, wherein one inlet of the fuel gas mixing pipeline is communicated with natural gas (LNG), the other inlet of the fuel gas mixing pipeline is communicated with methane of the gas storage tank, and the outlet of the fuel gas mixing pipeline is communicated with the heating furnace.
6. The heat preservation of the steel waste heat methane tank and the fuel supply system of the methane heating furnace according to claim 1, characterized in that: and a pressurizing device is arranged on the gas mixing pipeline so that the natural gas (LNG) and the biogas are mixed more uniformly.
7. The heat preservation of the steel waste heat methane tank and the fuel supply system of the methane heating furnace according to claim 1, characterized in that: the inlet and the outlet of the heat exchange coil are connected with the heat exchanger, and the circulating water in the coil exchanges heat with the steam to adjust the temperature, so that the biogas fermentation device can ferment more stably.
8. The heat preservation of the steel waste heat methane tank and the fuel supply system of the methane heating furnace according to claim 1, characterized in that: the discharge port of the biogas fermentation device is connected with a solid-liquid separation device, and the liquid outlet of the solid-liquid separation device is communicated with the raw material storage premixing tank, so that a part of separated biogas slurry can dilute the raw material in the premixing tank.
9. The treatment method of the heat preservation of the steel waste heat methane tank and the fuel supply system of the methane heating furnace according to any one of the claims 1 to 8, characterized by comprising the following steps:
(1) purifying the biogas generated by the biogas fermentation device by a biogas purification device, and then feeding the biogas into a gas storage tank;
(2) the biogas in the gas storage tank is directly conveyed to a heating furnace heat source of a steel enterprise through a pipeline, and can be independently used as fuel or mixed with the currently used Liquefied Natural Gas (LNG) to be used as fuel;
(3) cooling the walking beam and the fixed beam in the heating furnace by using cooling water, and heating the cooling water to obtain water vapor with the temperature of 120-150 ℃;
(4) the steam generated by cooling water in the heating furnace is introduced into a biogas plant area through a pipeline, and after the steam exchanges heat with hot water to reach a proper temperature, the biogas fermentation device and the raw material storage premixing tank are heated and insulated through the coil pipe, so that the microbial activity, the organic matter fermentation rate and the gas production stability in the biogas tank are improved.
10. The processing method of claim 9, further comprising:
(5) separating the waste fermented by the biogas fermentation device into biogas slurry and biogas residues through a solid-liquid separation device, conveying one part of the biogas slurry serving as a dilution liquid to a raw material storage premixing pool for diluting the raw material, and using the other part of the biogas slurry as a liquid fertilizer; wherein the biogas residues are used as organic fertilizers.
CN202110842261.8A 2021-07-26 2021-07-26 Heat preservation and methane heating furnace fuel supply system for steel waste heat methane tank and treatment method Pending CN113444618A (en)

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